Drop all objects that depend on plpythonu in init.sql
LDA: Adding basline tests for 20newsgroup and reuters21578 datasets
GeneralCV: Allow larger range of error for verification tests.
Remove PLDA from testsuite and remove unnecessary yaml files
Removed loading of PLDA datasets
General updates to eliminate small errors

- init_cases.sql significantly cleaned up
- Increased error margin for general CV logregr
Needed more cleanup on init_cases